diff --git a/apps/news/models.py b/apps/news/models.py
index da860c50..7c585148 100644
--- a/apps/news/models.py
+++ b/apps/news/models.py
@@ -370,11 +370,12 @@ class News(GalleryMixin, BaseAttributes, TranslatedFieldsMixin, HasTagsMixin,
             slug = NewsSlug.parse(raw_slug, country_codes)
             similar_slugs = sorted(x for x in all_slugs if NewsSlug.parse(x, country_codes).value == slug.value)
             if len(similar_slugs) == 0:
-                new_slugs[locale] = NewsSlug(slug.value, new_country.code)
+                # It is impossible because at least current instance has slug
+                raise ValueError('Duplicating unsaved object')
             else:
                 last_slug = NewsSlug.parse(similar_slugs[-1], country_codes)
                 new_slug = NewsSlug(slug.value, new_country.code, last_slug.count)
-                if last_slug.locale is not None:
+                if last_slug.country_code is not None:
                     new_slug.count += 1
 
                 new_slugs[locale] = str(new_slug)